Nis­san has opened the largest lithi­um-ion bat­tery plant in the US at its Smyr­na, Tenn., facil­i­ty, to go under the hood dur­ing ramp-up of pro­duc­tion of its 2013 Nis­san Leafs ear­ly next year. The mile­stone also marks the two year anniver­sary of the Nis­san Leaf in the US mar­ket, where 18,000 units have been sold and 46,000 world­wide. So far, it’s the largest sell­ing bat­tery elec­tric vehi­cle in his­to­ry.